ELEVATED SERVICE TEMPERATURE EFFECTS ON IMPACT BEHAVIOR OF RAP-SUBSTITUTED GEOPOLYMER CONCRETE
ISPEC 21. INTERNATIONAL CONFERENCE ON ENGINEERING & NATURAL SCIENCES, Adana, Turkey, 5 - 09 July 2026, pp.411-416, (Full Text)
- Publication Type: Conference Paper / Full Text
- City: Adana
- Country: Turkey
- Page Numbers: pp.411-416
- Open Archive Collection: AVESIS Open Access Collection
- Kayseri University Affiliated: Yes
Abstract
This study investigated the impact behavior of RAP-substituted geopolymer concrete under increasing service temperatures. Geopolymer concrete samples were cast utilizing a variety of mix designs that incorporated recycled asphalt pavement (RAP) aggregates as a substitute for fine aggregate. The impact behavior of the concrete products was examined at different service temperatures. Fixed ratios (2.0) of sodium silicate to sodium hydroxide solutions served as alkali activators. Fly ash (FA) and groundgranulated blast-furnace slag (GGBFS) were used as binders. The RAP substitution ratios for the mixtures were 0%, 33%, and 66%, while the GGBFS proportion to the total binder was set at 16.5%, 33%, and 66%. The study considered temperature levels of 25 °C for ambient conditions and 75 °C for elevated service temperatures. Impact tests were conducted using an instrumented drop-weight test setup. The findings indicate that the impact performance of paving stones may be significantly influenced by rising service temperatures. In many of the mixtures, the impact performance declined slightly as the ambient temperature increased. However, a 33% RAP substitution demonstrated better impact performance than the control samples under elevated temperature, making it the optimal ratio in the scope of the study. An increase in the GGBFS ratio improves impact performance at moderate ambient temperature, but this effect reverses at higher service temperature, and performance deteriorates with increasing GGBFS.